A representation, especially in writing, made by a seller or company to a purchaser of a product or service that a refund, repair, or replacement will be made if the product or service proves defective or unsatisfactory, especially within a given time period, The insured's guarantee that the facts are as stated in reference to an insurance risk or that specified conditions will be fulfilled to keep the contract effective, Justification or valid grounds for an act or a course of action, verb_ To warrant; to guarantee, transitive verb_ To provide a warranty for